Why sceGuFrontFace(GU_CW)?

[lego]

Hi, everybody.

Why much code for psp use clockwise instead of counter-clockwise like an OpenGL by default :-)?

Thanks.

[jojojoris]

Probably cause the coder wants to.

That's realy the only answer. Iy you want to use GU_CCW you can use GU_CCW.

[dridri]

This is the source code :

Code: Select all

void sceGuFrontFace(int order)
{
	if (order)
		sendCommandi(155,0);
	else
		sendCommandi(155,1);
}

Yes its a special way, because if you write GU_CW the GU_CCW mode is used, and if you write GU_CCW the GU_CW mode is used...

I think it's due to the PSPGU's programmer reversed a game to know how the PSPGE is used and next write the PSPGU, maybe this game was in CW mode...

[Jim]

Say you wanted to render an object on a reflective floor.

You would draw object A with CCW, then negate the Y axis in your model view, then draw object A with CW.

Jim

[lego]

Thanks for replies.